Mössbauer and infrared studies of the Cu-Cr ferrites

Ferrites of the system CuCrxFe2−x O4, wherex=0,0.2,0.4, 0.6 and 0.8, have been studied by Mössbauer and IR absorption spectra. Mössbauer spectra were recorded at room temperature. The spectra of all samples showed two well defined Zeeman patterns corresponding to A and B sites. The effect of the variation of chromium substitution on the various hyperfine interactions has been discussed. The cationic distribution makes clear that all Cr3+ ions occupy octahedral sites. The IR spectra in the range 200–4000 cm−1 showed the presence of four bands. The high and low frequency bandsv 1 andv 2 belong to the tetrahedral and octahedral sites, respectively. Small bandsv 3 andv 4are observed around v2 and are assigned to the octahedral divalent metal-oxygen ion complexes and the lattice vibrations of the system, respectively.